Add pinball map API to Geocoding section

README.md

@@ -897,6 +897,7 @@ API | Description | Auth | HTTPS | CORS |
 | [OpenCage](https://opencagedata.com) | Forward and reverse geocoding using open data | `apiKey` | Yes | Yes |
 | [openrouteservice.org](https://openrouteservice.org/) | Directions, POIs, isochrones, geocoding (+reverse), elevation, and more | `apiKey` | Yes | Unknown |
 | [OpenStreetMap](http://wiki.openstreetmap.org/wiki/API) | Navigation, geolocation and geographical data | `OAuth` | No | Unknown |
+| [Pinball Map](https://pinballmap.com/api/v1/docs) | A crowdsourced map of public pinball machines | No | Yes | Yes |
 | [positionstack](https://positionstack.com/) | Forward & Reverse Batch Geocoding REST API | `apiKey` | Yes | Unknown |
 | [PostcodeData.nl](http://api.postcodedata.nl/v1/postcode/?postcode=1211EP&streetnumber=60&ref=domeinnaam.nl&type=json) | Provide geolocation data based on postcode for Dutch addresses | No | No | Unknown |
 | [Postcodes.io](https://postcodes.io) | Postcode lookup & Geolocation for the UK | No | Yes | Yes |